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NOVA integrated alignment/diagnostic sensors

Description: Under Contract 3772003 to the Lawrence Livermore Laboratory, Aerojet ElectroSystems Company has investigated a number of alignment system design topics for the NOVA and SHIVA upgrade lasers. Prior reports dealt with the Main Beam Alignment System, and with Multipass Amplifier Alignment Concepts. This report, which completes the contract, examines ways in which the Return Beam Diagnostic (RBD) package and Incident Beam Diagnostic (IBD) packages may be reconfigured to a more integrated package. I… more
Date: January 18, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Beam bunching in a final storage ring

Description: A calculation is presented for the final bunching of a particle beam in a synchrotron or storage ring. The voltage per turn, the harmonic number, and the bunching time are obtained. (PMA)
Date: November 18, 1977
Creator: Lambertson, G.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Extension of the method of the small angle approximation: open detector

Description: We use the radiative transfer equation to study the multiple scattering undergone by a laser beam propagating through a turbid medium. During the propagation, we view the beam as first scattering into a narrow forward cone, and then into a diffuse pattern. To describe this process, we propose a systematic and practical method to combine the small angle approximation with the diffusion approximation. The method works when the scattering cross-section describing scattering from aerosols can be wr… more
Date: August 18, 1986
Creator: Chitanvis, S.M. & Gerstl, S.A.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improved performance of the ATA injector

Description: During the last year we re-configured the ATA injector to accommodate field emission cathodes. The injector is now run as a diode machine with a 7 cm radius cathode, an A-K gap of 12.9 cm and a field stress of 190 kV/cm. The advantage of using field emission cathodes is we have increased the injector brightness by a factor of ten above the level we were able to reach using the low density plasma cathodes.
Date: June 18, 1985
Creator: Weir, J.T.; Caporaso, G.J. & Prono, D.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Brookhaven electron analogue, 1953--1957

Description: The following topics are discussed on the Brookhaven electron analogue: L.J. Haworth and E.L. VanHorn letters; Original G.K. Green outline for report; General description; Parameter list; Mechanical Assembly; Alignment; Degaussing; Vacuum System; Injection System; The pulsed inflector; RF System; Ferrite Cavity; Pick-up electrodes and preamplifiers; Radio Frequency power amplifier; Lens supply; Controls and Power; and RF acceleration summary.
Date: December 18, 1991
Creator: Plotkin, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tunable plasmonic lattices of silver nanocrystals

Description: Silver nanocrystals are ideal building blocks for plasmonicmaterials that exhibit a wide range of unique and potentially usefuloptical phenomena. Individual nanocrystals display distinct opticalscattering spectra and can be assembled into hierarchical structures thatcouple strongly to external electromagnetic fields. This coupling, whichis mediated by surface plasmons, depends on their shape and arrangement.Here we demonstrate the bottom-up assembly of polyhedral silvernanocrystals into macrosc… more
Date: February 18, 2008
Creator: Tao, Andrea; Sinsermsuksakul, Prasert & Yang, Peidong
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Significant Lifetime and Background Improvements in PEP-II by Reducing the 3rd Order Chromaticity in LER with Orbit Bumps

Description: Orbit bumps in sextupoles are routinely used for tuning the luminosity in the PEP-II B-Factory. Anti-symmetric bumps at a pair of identical sextupoles separated by -I section generate the net dispersion, while symmetric horizontal bumps induce a tune shift and beta beat. By combining two of these symmetric bumps with opposite signs, where the second pair is 90{sup o} away, the tune shift cancels and the beta beat doubles. In the low energy ring (LER), there are four -I sextupole pairs per arc, … more
Date: December 18, 2007
Creator: Decker, F. J.; Nosochkov, Y.; Sullivan, M. & Yocky, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A System for Measuring Defect Induced Beam Modulation on Inertial Confinement Fusion-class Laser Optics

Description: A multi-wavelength laser based system has been constructed to measure defect induced beam modulation (diffraction) from ICF class laser optics. The Nd:YLF-based modulation measurement system (MMS) uses simple beam collimation and imaging to capture diffraction patterns from optical defects onto an 8-bit digital camera at 1053, 527 and 351 nm. The imaging system has a field of view of 4.5 x 2.8 mm{sup 2} and is capable of imaging any plane from 0 to 30 cm downstream from the defect. The system i… more
Date: October 18, 2005
Creator: Runkel, M.; Hawley-Fedder, R.; Widmayer, C.; Williams, W.; Weinzapfel, C. & Roberts, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Tunable nanowire nonlinear optical probe

Description: One crucial challenge for subwavelength optics has been thedevelopment of a tunable source of coherent laser radiation for use inthe physical, information, and biological sciences that is stable at roomtemperature and physiological conditions. Current advanced near-fieldimaging techniques using fiber-optic scattering probes1,2 have alreadyachieved spatial resolution down to the 20-nm range. Recently reportedfar-field approaches for optical microscopy, including stimulatedemission depletion (STE… more
Date: February 18, 2008
Creator: Nakayama, Yuri; Pauzauskie, Peter J.; Radenovic, Aleksandra; Onorato, Robert M.; Saykally, Richard J.; Liphardt, Jan et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experiments on ETA comparing wire-conditioned and non-wire-conditioned beam propagation

Description: This report describes experiments in beam propagation with the ETA beam during 1982 following accelerator cavity modifications which allowed a maximum beam current of up to 8 kA at the entrance to the propagation tank. A prominent new feature of the propagation in high pressure gas was an enhancement of the net current as the beam propagated. In some cases this enhanced current was nearly double the injected beam current. The strong current enhancement was associated with strong transverse hose… more
Date: January 18, 1984
Creator: Clark, J. C.; Lauer, E. J.; Prono, D. S. & Struve, K. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Studies of Plasma Wake-Field Acceleration and Focusing

Description: More than four years after the initial proposal of the Plasma Wake-field Accelerator (PWFA), it continues to be the object of much investigation, due to the promise of the ultra-high accelerating gradients that can exist in relativistic plasma waves driven in the wake of charged particle beams. These large amplitude plasma wake-fields are of interest in the laboratory, both for the wealth of basic nonlinear plasma wave phenomena which can be studied, as well as for the applications of accelerat… more
Date: July 18, 1989
Creator: Rosenzweig, J. B.; Cole, B.; Ho, C.; Gai, W.; Konecny, R.; Mtingwa, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fundamental theory of light for applications: Notes for five informal lectures

Description: These notes give an overview of some aspects of the quantum theory of light and its interaction with matter. A description is given of basic emission and absorption processes, as well as the theory of photodetection and optical coherence. Basic research in this area is increasingly relevant to areas of technological importance, including microlaser devices and the noise characteristics of semiconductor lasers.
Date: June 18, 1993
Creator: Milonni, P.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hysteresis of sextupole and ac loss in Energy Doubler dipole magnets

Description: A simple model gave utilized for calculation of magnetization effects on ac loss and sextupole for Energy Doubler dipole magnets. The calculation in the simple model gave an underestimation of ac loss by about 30%. Results of computation on ac harmonics were also described.
Date: June 18, 1982
Creator: Ishibashi, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Snakes and spin rotators

Description: The generalized snake configuration offers advantages of either shorter total snake length and smaller orbit displacement in the compact configuration or the multi-functions in the split configuration. We found that the compact configuration can save about 10% of the total length of a snake. On other hand, the spilt snake configuration can be used both as a snake and as a spin rotator for the helicity state. Using the orbit compensation dipoles, the spilt snake configuration can be located at a… more
Date: June 18, 1990
Creator: Lee, Si Young
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

HELIA - high energy linear induction accelerators

Description: A novel approach to providing high voltage (>10 MV), high current (>200 kA), short duration (20-40 ns), particle beam pulses is described. The approach uses 1 MV Metglas isolated cavities driven by water pulse lines. These are stacked in series by using a magnetically insulated cathode stalk. Results from modeling of the cavity and cores and from a full sized single-cavity experiment are discussed. Plans for a four-cavity experiment to prove the principle of voltage addition by stacking cavitie… more
Date: June 18, 1984
Creator: Hasti, D. E.; Ramirez, J. J.; Corley, J. P.; Poukey, J. W.; Prestwich, K. R.; Genuario, R. D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radiation-to-light converters for nuclear environments: deep red emitters

Description: This report gives the preliminary results on work done to find a scintillator that is compatible with high-bandwidth, long-distance fiber-optic transmission. The requirements for such a scintillator are: (1) emission in the near-IR; (2) linear output over 2 to 3 decades of input excitation; (3) time response < 2 ns; and (4) immunity to radiation damage. The behavior of single crystal cadmium sulfide (CdS) and cadmium selenide (CdSe) was examined under electron and laser excitation. Both crystal… more
Date: June 18, 1981
Creator: Rotter, M. D.; Roeske, F.; Calavan, P. M. & Lutz, S. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Polarization and phase effects in coatings

Description: Thin film interference coatings are a commonplace addition to surfaces polished in a modern optical fabrication facility. These coatings can have a dramatic effect on the optical performance of the optical component to which they are applied. In this presentation, those effects which are related to polarization of the incident beam or the phase shift difference on reflection (retardation) are discussed.
Date: October 18, 1982
Creator: Scott, M.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Coupling correction using closed orbit measurements

Description: The authors describe a coupling correction scheme they have developed and used to successfully reduce the vertical emittance of the NSLS X-Ray ring by a factor of 6 to below 2 A. This gives a vertical to horizontal emittance ratio of less than 0.2%. They find the strengths of 17 skew quadrupoles to simultaneously minimize the vertical dispersion and the coupling. As a measure of coupling they utilize the shift in vertical closed orbit resulting from a change in strength of a horizontal steering… more
Date: February 18, 1994
Creator: Safranek, J. & Krinsky, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Brookhaven electron analogue, 1953--1957

Description: The following topics are discussed on the Brookhaven electron analogue: L.J. Haworth and E.L. VanHorn letters; Original G.K. Green outline for report; General description; Parameter list; Mechanical Assembly; Alignment; Degaussing; Vacuum System; Injection System; The pulsed inflector; RF System; Ferrite Cavity; Pick-up electrodes and preamplifiers; Radio Frequency power amplifier; Lens supply; Controls and Power; and RF acceleration summary.
Date: December 18, 1991
Creator: Plotkin, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermally induced dephasing in periodically poled KTiOPO4 nonlinear crystals

Description: Experimental data that exhibits a continuous-wave, second-harmonic intensity threshold (15 kW/cm{sup 2}) that causes two-photon nonlinear absorption which leads to time-dependent photochromic damage in periodically poled KTiOPO{sub 4} is presented and verified through a thermal dephasing model.
Date: March 18, 2004
Creator: Dawson, J W; Pennington, D M; Jovanovic, I; Liao, Z M; Payne, S A; Drobshoff, A D et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Advanced Adaptive Optics Technology Development

Description: The NSF Center for Adaptive Optics (CfAO) is supporting research on advanced adaptive optics technologies. CfAO research activities include development and characterization of micro-electro-mechanical systems (MEMS) deformable mirror (DM) technology, as well as development and characterization of high-resolution adaptive optics systems using liquid crystal (LC) spatial light modulator (SLM) technology. This paper presents an overview of the CfAO advanced adaptive optics technology development a… more
Date: September 18, 2001
Creator: Olivier, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Matlab Based LOCO

Description: The LOCO algorithm has been used by many accelerators around the world. Although the uses for LOCO vary, the most common use has been to find calibration errors and correct the optics functions. The light source community in particular has made extensive use of the LOCO algorithms to tightly control the beta function and coupling. Maintaining high quality beam parameters requires constant attention so a relatively large effort was put into software development for the LOCO application. The LOCO… more
Date: October 18, 2011
Creator: Portmann, Greg; Safranek, James & Huang, Xiaobiao
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fundamental theory of light for applications: Notes for five informal lectures

Description: These notes give an overview of some aspects of the quantum theory of light and its interaction with matter. A description is given of basic emission and absorption processes, as well as the theory of photodetection and optical coherence. Basic research in this area is increasingly relevant to areas of technological importance, including microlaser devices and the noise characteristics of semiconductor lasers.
Date: June 18, 1993
Creator: Milonni, P. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LOCO with Constraints and Improved Fitting Technique

Description: LOCO has been a powerful beam-based diagnostics and optics control method for storage rings and synchrotrons worldwide ever since it was established at NSLS by J. Safranek. This method measures the orbit response matrix and optionally the dispersion function of the machine. The data are then fitted to a lattice model by adjusting parameters such as quadrupole and skew quadrupole strengths in the model, BPM gains and rolls, corrector gains and rolls of the measurement system. Any abnormality of … more
Date: June 18, 2009
Creator: Huang, Xiaobiao; Safranek, James & Portmann, Greg
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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